Just found a tunnel cam video of this game on LCFC player. If you have a CAFC player account you can log in to watch it. It's not overly interesting but gives you a look behind the scenes and it's similar to the tunnel cam thing that Man City do. It's great to hear the songs at the final whistle!
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http://www.player.lcfc.com/latest-news/article/3083733/date/20130220120000/page/0/name/Tunnel-Cam:-Charlton-Athletic